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The following images were taken as part of the PSF program (4788) or
else in the absolute sensitivity program (4787). All images can be
found in the subdirectory f96/foc+costar/. All PSF stars are centered
relatively well in the field of view. In every case, the target is
BPM16274. The format indicators follow this rule:

"n" refers to normal pixels, "z" to zoomed pixels.

The format indicator is made up of 2 numbers that give you
the size of the format in pixels, with x first and y second. If the format is
nij, then the size of the image is 1024*2**-i by 1024*2**-j. So if i is 1 and
j is 1 (i.e. n11 format), the expanded format is 1024*2^-1 (=512) by 1024*2^-1
(=512). The following are possible formats:

There are more PSFs for the F486N filter that were taken as part of
the alignment program or else as a probe of field effects, users should
contact STScI for more information.

The PSF for the F320W filter reflects the problems arising from its severe
filter-induced image shift. This filter shift moves the PSF to the edge of
the 256x256 field of view and induces the aberrations seen in this PSF.